There were errors concerning drug dosages and method of administration in the article entitled "A Comparison of the Effect of Ipratropium and Albuterol in the Treatment of Chronic Obstructive Airway Disease" that appeared in the March 1989 issue of the Archives (1989;149:544-547). On page 544, in the second column, lines 57 through 61, and page 545, lines 1 and 2, the sentence read as follows: "If on the days of the study they met this criterion, they were randomly given one of three test aerosols delivered by an identical, metered dose inhaler; these contained either (1) ipratropium bromide (two inhalations or 36 g), albuterol (two inhalations or 200 g), or (3) placebo (two inhalations). One technician delivered the aerosol 15 cm from the mouth." The sentence should have read as follows: "If on the days of the study they met this criterion, they were randomly given three test aerosols delivered
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